FieldSet&Grid issues

Description
There seems to be a bug using a Grid inside a FieldSet inside a Container which gives the remaining space to that FieldSet. Sounds confusing, so just look at my test case. A Grid is placed into a FieldSet. The FieldSet is placed into a BorderLayoutContainer (center). In that case the grid's cells aren't visible, although the contained values are visible through Firebug. Same behaviour while using a VerticalLayoutContainer and adding the FieldSet with VerticalLayoutData(1,1).

This isn't a bug. A Grid doesn't have any specific size until one is given to it. You can give a Grid a size by putting it into a panel that assigns a size to its children (such as Viewport) or by specifying a size explicitly with setters. Since the FieldSet doesn't assign a size, you'll have to do so yourself.

That being said, why exactly do you need to have a Grid in a FieldSet? A Grid isn't a form field.